18
309916
Troubleshooting
Before performing any Troubleshooting procedures, follow
Pressure Relief Procedure
on page 6.
PROBLEM
CAUSE
SOLUTION
Compressor not building
pressure or poor air flow
Open gun air valve (23)
Close valve.
Air leak
Check all fittings and valve/regulator
settings.
Unloader stuttering, unloading
too early, or unloading too late.
Damaged unloader
Replace.
No material output from pump
Not enough air pressure to pump
Shut off air at the gun, and increase
air pressure to the pump to
maximum. Turn regulator clockwise
to increase.
Material too thick
Thin the material. Material must be
mixed thoroughly to a consistency
that immediately folds back in as
you draw your finger through the
surface of the material.
Damaged checkballs or seats
Replace checkballs or seats.
Plugged gun or nozzle
Relieve pressure
, page 6. Re-
move gun from material hose, and
cycle pump.
NOTE:
A plugged gun or nozzle
may cause the hose and pump to
plug. If necessary, flush hose and
pump with clean water before
cycling material through the hose
with the gun removed.
Plugged hose, or hose too small
Relieve pressure
, page 6. Flush
hose with clean water, or try a 1–1/4
in. hose.
Pump stops pumping
Stalled pump
Shut down system.
Relieve pres-
sure
, page 6. Restart.
Contact an authorized Graco ser-
vice center.
Engine won’t start
Engine switch is OFF
Turn engine switch ON.
Engine is out of gas
Refill gas tank. Honda Engine
Owners Manual.
Engine oil level is low
Try to start engine. Replenish oil, if
necessary. Honda Engine Owners
Manual.
Spark plug cable disconnected or
damaged
Connect spark plug cable or replace
spark plug.
Cold engine
Use choke.
Fuel shutoff lever is OFF
Move lever to ON position.
Oil is seeping into combustion
chamber
Remove spark plug. Pull starter 3
or 4 times. Clean or replace spark
plug. Start engine. Keep sprayer
upright to avoid oil seepage.